CN103560853B - The frequency stabilization system and method for multiple light courcess in multi-subcarrier system - Google Patents
The frequency stabilization system and method for multiple light courcess in multi-subcarrier system Download PDFInfo
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- CN103560853B CN103560853B CN201310472378.7A CN201310472378A CN103560853B CN 103560853 B CN103560853 B CN 103560853B CN 201310472378 A CN201310472378 A CN 201310472378A CN 103560853 B CN103560853 B CN 103560853B
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- 238000011105 stabilization Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 5
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Abstract
The frequency stabilization system and method for multiple light courcess in multi-subcarrier system, relate to optical communication field, comprise n separate lasers, N × 2 wave multiplexer, two array waveguide gratings, n group sniffer and n feedback circuits, wherein N >=n >=1, n separate lasers is as multi wave length illuminating source; N × 2 wave multiplexer converges the light of n different wave length, and divides equally and output to two array waveguide gratings; Array waveguide grating filtering is also exported the two-way monitoring light of corresponding Different Light; Every group of sniffer comprises two photodiodes, receives respectively the two-way monitoring light of corresponding same light source; Feedback circuit connects respectively every group of sniffer and corresponding laser instrument thereof, more every group of two luminous powers that detection arrives, and according to the output wavelength of the result fine setting laser instrument corresponding with it; The present invention can use lower cost to keep the wavelength interval of multiple arbitrary sources stable in DWDM and Nyquist-WDM system.
Description
Technical field
The DWDM and the multi-subcarrier system that the present invention relates to optical communication field, be specificallyThe frequency stabilization system and method for multiple light courcess in a kind of multi-subcarrier system.
Background technology
The development of high speed optical communication goes short of the spectrum width resource of optical fiber. Based onDWDM (DenseWavelengthDivisionMultiplexing, intensive multiplexed optical wave is used)In the large capacity optical transmission system of multi-subcarrier technology, be to reduce crosstalking between adjacent channel to needKeep between radio frequency channel interval enough large, tend to like this reduce spectrum efficiency. Therefore control light sourceWave length shift, stable center wavelength spacing, many in DWDM and multi-subcarrier systemIndividual arbitrary source is very necessary.
Existing multi-subcarrier generation technique high performance narrow linewidth light source, the single sources of using moreCost is very high has limited that it is extensively commercial. And ripe commercial laser instrument can not meet as DFBHigher wavelength control requirement, can the reach ± 2.5GHz of centre wavelength fluctuation of DFB, and based onThe channel spacing minimum arranging in the large capacity Nyquist-WDM system of high order modulation form is200MHz, the wavelength shift of each arbitrary source is easy to cause the overlapping of radio frequency channel. Due to DFBWavelength frequency etc. ripe light source is stable not, and is using multiple arbitrary sources to produce multicarrierTime, need to ensure that optical source wavelength interval is stable, therefore the ripe light source such as DFB can't at presentStable for Nyquist-WDM system.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of many sons to carryIn wave system system, the frequency stabilization system and method for multiple light courcess, keeps the wavelength interval of multiple light sources steadyFixed, reduce crosstalking and frequency difference when coherent reception between adjacent channel, reduce DWDM andThe cost of Nyquist-WDM system.
For reaching above object, the invention provides the frequency of multiple light courcess in a kind of multi-subcarrier systemSystems stabilisation, comprises n separate lasers, N × 2 wave multiplexer, two Waveguide arraysGrating, n group sniffer and n feedback circuit, wherein N >=n >=1, is characterized in that:A described n separate lasers is as multi wave length illuminating source; N × 2 wave multiplexer is used for converging described manyThe light of individual wavelength, and divide equally and output to connected two array waveguide gratings; Each arrayWaveguide optical grating all has identical several destination interfaces and identical Free Spectral Range, for filtering alsoExport the monitoring light of corresponding Different Light; Described every group of sniffer comprises two photodiodes,Receive respectively the monitoring light from the corresponding same light source of two array waveguide gratings; Described feedbackCircuit connects respectively every group of sniffer and corresponding laser instrument thereof, and more every group of sniffer visitedTwo luminous powers that measure, and according to the comparative result fine setting laser instrument corresponding with it.
On the basis of technique scheme, two groups of photoelectricity in described every group of Electro-Optical Sensor SetLuminous power size is converted into voltage by diode, and each feedback circuit is two photoelectricity two more on the same groupThe voltage that utmost point pipe is surveyed, and the laser instrument of tuning correspondence; According to the big or small control wave of feedback voltageLong tuning speed, the direction of the positive and negative control wavelength tuning of feedback voltage.
On the basis of technique scheme, two photodiodes of described every group of snifferWhen detection of optical power equates, feedback voltage is 0, and wavelength is stable state; If one of themThe luminous power that photodiode detects is greater than the luminous power that another photodiode detects,Adjust laser wavelength skew by feedback circuit, make through two array waveguide grating filteringAfter monitoring luminous power approach, feedback voltage is tending towards 0.
On the basis of technique scheme, described each array waveguide grating has at least nPort, the number of described photodiode is 2n, the number of described feedback circuit is n.
The present invention also provides a kind of frequency stablization method based on described system, n independent laserDevice sends the light of multiple different wave lengths, converges described multiple different wave length by N × 2 wave multiplexerLight, and divide equally and output to two array waveguide gratings, wherein N >=n >=1, by each arrayWaveguide optical grating light splitting the monitoring light that leaches corresponding Different Light are to each port; Every group of snifferInterior two photodiodes prison to the same light source from two array waveguide gratings respectivelyOptical power detecting is carried out in photometry; Each feedback circuit passes through two of every group of sniffer outputsVoltage compares, according to the output wavelength of the comparative result fine setting laser instrument corresponding with it, straightTwo detection of optical power to every group of sniffer equate.
Beneficial effect of the present invention is: utilize array waveguide grating (AWG, ArrayedWaveguideGrating) stable Free Spectral Range (FSR) and filtering characteristic, by oftenThe luminous power that two photodiodes (PD, photodiode) of group sniffer are surveyed is compared, it is stable that feedback control circuit keeps the wavelength interval of multiple light sources. Owing to detecting luminous powerNot with predetermined calibration value comparison, so reduced because of the variation of PD detection of optical power tuningMonitoring optical wavelength, has reduced the absolute drift of monitoring optical wavelength, uses lower cost to realize multipleThe wavelength interval of monitoring radiant is stable, has also reduced the fluctuation of multi-wavelength monitoring light frequency.
Brief description of the drawings
Fig. 1 is the schematic diagram of the frequency stabilization system of multiple light courcess in multi-subcarrier system of the present invention;
Fig. 2 is the schematic diagram of the two array waveguide grating control wave length shifts of the present invention;
Fig. 3 reduces the schematic diagram that array waveguide grating temperature is waftd to wavelength affects;
Fig. 4 eliminates detection of optical power to change the schematic diagram to wavelength affects.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the frequency stabilization system of multiple light courcess in multi-subcarrier system of the present invention, bagDraw together n laser instrument (LD1～LDn), N × 2 wave multiplexer, two array waveguide gratings(AWG1 and AWG2), n group sniffer, a n feedback circuit, wherein N >=n >=1,Every group of sniffer comprises two photodiode (PD1、PD2～PD2n-1、PD2n). InstituteThe operation wavelength of stating n laser instrument is fixed intervals, and as multi wave length illuminating source, ripple is closed in N × 2Device connects respectively AWG1 and AWG2, for receiving the light of described multiple wavelength; AWG1All there is port and the identical Free Spectral Range of similar number, each AWG tool with AWG2There is at least n port, be used for filtering export the monitoring light of corresponding Different Light. Described two groupsSniffer comprises that total number of photodiode is 2n, a light in every group of snifferElectric diode is corresponding with a port of AWG1, is used for surveying the monitoring light from AWG1,Another photodiode is corresponding with a port of AWG2, is used for surveying from AWG2Monitoring light, and the monitoring light that in every group, two photodiodes detect is from same light source.The output of described every group of sniffer all connects a corresponding feedback circuit, each feedback circuitConnect a laser instrument corresponding with it, by the electricity that two photodiodes are surveyed more on the same groupPress, in the time that the voltage of two-way detection equates, optical source wavelength is stable state; Otherwise according to spyMeasure detecting voltage extent and positive and negative, the output wavelength of feedback regulation laser instrument moves to left or is rightMove.
The present invention is based on the frequency stablization method of said system, n separate lasers sent multipleThe light of different wave length, converges by N × 2 wave multiplexer after the light of described multiple wavelength, and power is equalBe distributed into AWG1 and AWG2, AWG1 and AWG2 light splitting leach corresponding different respectivelyThe monitoring light of light source is to each port, and two photodiodes in every group of sniffer are to coming respectivelyMonitoring light from the same light source of AWG1 and AWG2 carries out optical power detecting, by luminous powerSize is converted into voltage, passes to connected feedback circuit and compares, each feedback circuitTwo voltage differences that photodiode detection of optical power transforms, micro-according to comparative result more on the same groupAdjust the laser wavelength corresponding with it, until two detection of optical power of every group of sniffer equate.
As shown in Figure 2, be the schematic diagram of the two array waveguide grating control wave length shifts of the present invention.The centre wavelength of monitoring light drops on the fading zone, left and right of two array waveguide raster pass-bands, logical like thisCross two array waveguide gratings and have different power attenuations. Expect two photodiodes detectionsMonitoring optical wavelength when electric current equates is stable state, supposes that last probe power is at a point. WithPD in same group1、PD2For example, if PD1The AWG1 port monitoring light detectingLuminous power drops on c point, PD2The AWG2 port detecting is monitored the luminous power of light at the b point that falls,Pb>Pc, should adjust monitoring optical wavelength by feedback circuit control LD1 and move to left; If insteadPb<Pc, should adjust monitoring optical wavelength by feedback circuit control LD1 and move to right. Described feedback electricityRoad feeds back to the speed of the size control wavelength tuning of the feedback voltage of laser instrument, feedback voltageThe direction of direction control wavelength tuning.
Principle in the present embodiment is: use two array waveguide gratings and n group sniffer,The luminous power that every group of photodiode surveyed is through relatively determining the point of safes of wavelength, and do not depend onIn fixing performance number, therefore waft and array waveguide grating input light merit in array waveguide grating temperatureRate when fluctuation, reduce and cause frequently because of the size variation tuning wavelength of photodiode probe powerRate skew.
As shown in Figure 3, for the present invention reduces the signal that array waveguide grating temperature is waftd to wavelength affectsFigure. When there is skew in one of them AWG operation wavelength, based on stablizing detection of optical powerMethod, need to send laser instrument the wavelength regulation of monitor optical to e point, and actual the application sideIn method, value is adjusted to d point, wavelength regulation scope reduces half.
As shown in Figure 4, attenuation change in due to light source output power or optical link, twoWhen AWG input power reduces, the method based on stablizing detection of optical power need be by wavelength regulation extremelyG point or h point, and in actual the application's method, be finally stable at f, do not need adjusting wavelength.Because point of safes and the AWG input power of detection of optical power are irrelevant, therefore input at AWGPower reduces can keep the stable of wavelength constantly.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications,Within these improvements and modifications are also considered as protection scope of the present invention. In this description, do not do in detailThe content of describing belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. a frequency stabilization system for multiple light courcess in multi-subcarrier system, comprises n independentlyLaser instrument, N × 2 wave multiplexer, two array waveguide gratings, n group sniffer and nIndividual feedback circuit, wherein N >=n >=1, is characterized in that: a described n separate lasers is used asMulti wave length illuminating source; N × 2 wave multiplexer is used for converging the light of described multiple wavelength, and divides equally outputTo connected two array waveguide gratings; Each array waveguide grating has identical numberDestination interface and identical Free Spectral Range, for filtering the monitoring of exporting corresponding Different LightLight; Described every group of sniffer comprises two photodiodes, receives respectively from two arraysThe monitoring light of the corresponding same light source of waveguide optical grating; Described feedback circuit connects respectively every group of detectionDevice and corresponding laser instrument thereof, more every group of two luminous powers that detection arrives, andAccording to the comparative result fine setting laser instrument corresponding with it.
2. the frequency stabilization system of multiple light courcess in multi-subcarrier system as claimed in claim 1,It is characterized in that: two groups of photodiodes in described every group of Electro-Optical Sensor Set are large by luminous powerThe little voltage that is converted into, each feedback circuit is two voltages that photodiode is surveyed more on the same group,And the laser instrument of tuning correspondence; According to the speed of the size control wavelength tuning of feedback voltage, anti-The direction of the positive and negative control wavelength tuning of feedthrough voltage.
3. the frequency stabilization system of multiple light courcess in multi-subcarrier system as claimed in claim 2,It is characterized in that: when two photodiode detection of optical power of described every group of sniffer equate,Feedback voltage is 0, and wavelength is stable state; If one of them photodiode detectsLuminous power is greater than the luminous power that another photodiode detects, and adjusts by feedback circuitLaser wavelength skew, makes to approach through two filtered monitoring luminous powers of array waveguide grating,Feedback voltage is tending towards 0.
4. the frequency stabilization system of multiple light courcess in multi-subcarrier system as claimed in claim 1,It is characterized in that: described each array waveguide grating has at least n port, described photoelectricity twoThe number of utmost point pipe is 2n, and the number of described feedback circuit is n.
5. the frequency stablization method based on system described in claim 1, is characterized in that:N separate lasers sent the light of multiple different wave lengths, described in converging by N × 2 wave multiplexerThe light of multiple different wave lengths, and divide equally and output to two array waveguide gratings, wherein N >=n >=1,By each array waveguide grating light splitting the monitoring light that leaches corresponding Different Light to each port; OftenTwo photodiodes of group in sniffer same to from two array waveguide gratings respectivelyThe monitoring light of one light source carries out optical power detecting; Each feedback circuit passes through every group of snifferTwo output voltages compare, defeated according to the comparative result fine setting laser instrument corresponding with itGo out wavelength, until two detection of optical power of every group of sniffer equate.
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| CN113092411B (en) * | 2018-10-12 | 2022-11-11 | 上海禾赛科技有限公司 | Device and method for realizing self-stabilization of received light intensity based on laser array |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6144025A (en) * | 1999-01-13 | 2000-11-07 | Santec Corporation | Laser light source apparatus |
| EP1052526A2 (en) * | 1999-05-14 | 2000-11-15 | Lucent Technologies Inc. | Controlled multi-wavelenght etalon |
| CN1288172A (en) * | 1999-08-12 | 2001-03-21 | 富士通株式会社 | Optical amplification device, optical emitting device, optical transfering system and optical amplification method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6144025A (en) * | 1999-01-13 | 2000-11-07 | Santec Corporation | Laser light source apparatus |
| EP1052526A2 (en) * | 1999-05-14 | 2000-11-15 | Lucent Technologies Inc. | Controlled multi-wavelenght etalon |
| CN1288172A (en) * | 1999-08-12 | 2001-03-21 | 富士通株式会社 | Optical amplification device, optical emitting device, optical transfering system and optical amplification method |
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |